Abbreviate php if/or statement

Question

is there a way to abbreviate the following?

if ($chk == 1 || $chk == 3 || $chk == 5 || $chk == 7){
do some stuff
}

Thanks.

Answer 1

if (in_array($chk, array(1, 3, 5, 7))) ... 

Or, if you plan to include if-elseif-cascades, use switch statement:

switch($chk)
{
  case 1: case 3: case 5: case 7: 
    do_something();
    break; 
  case 10: case 30: case 50: case 70: 
    do_something_else();
    break; 
  default: 
    do_default();
}

Answer 2

If you use only uneven numbers, you could check the value. If the value is uneven, then the function will be executed

$unevenNumbers=array(1,2,3,4,5,7);

foreach($unevenNumbers as $nbr){
    if( $nbr % 2 !== 0){
        //do some stuff
    }
}